The perceptron strikes back

Abstract
We show that every AC0predicate is computedby a low-degree probabilistic polynomial over thereals. We show that circuits composed of a symmetricgate at the root with AND-OR subcircuitsof constant depth can be simulated by probabilisticdepth-2 circuits with essentially the samesymmetric gate at the root and AND gates of smallfanin at the bottom. In particular, every languagerecognized by a depth-d AC0circuit is decidableby a probabilistic perceptron of size 2O(log4dn)...

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